Replace non-ASCII characters in song names with question marks

[fenhl]

This is a quick fix for two bugs with the song name display:

• Characters in the Latin-1 Supplement block displaying as spaces
• Characters that are neither Basic Latin nor Latin-1 Supplement triggering a “ValueError: byte must be in range(0, 256)” exception while patching cosmetics — even if the song name display setting is off

A more proper fix would be to convert song names into the encoding used for text boxes and display them using the text box font, which is something @GSKirox has been investigating and which should replace this PR if it ends up working.